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Timelike Compton scattering on a spin-0 target with kinematic twist-4 precision

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arxiv 2503.02461 v1 pith:2QUWWNIO submitted 2025-03-04 hep-ph hep-exhep-thnucl-ex

V. Martinez-Fernandez , B. Pire , P. Sznajder , J. Wagner This is my paper
classification hep-phhep-exhep-thnucl-ex
keywords comptonscatteringcontributionskinematicleadingtargetthosetimelike
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We calculate the kinematic twist-3 and 4 corrections to the leading order amplitude of timelike Compton scattering (TCS) on a (pseudo-)scalar target, in the recently developed framework based on the conformal operator-product expansion. This allows us to compute the complete set of helicity amplitudes of the process, in particular those that vanish at leading twist. We compare the effects of higher twist contributions to TCS with those in deeply virtual Compton scattering (DVCS). Our estimates, based on a $\pi$-meson GPD model, indicate that these contributions are sizeable and will play a crucial role in the interpretation of data from current and forthcoming experiments.

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Cited by 5 Pith papers

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  3. Coherent deeply virtual Compton scattering on helium-4 beyond leading power

    hep-ph 2026-04 unverdicted novelty 6.0 of 10

    Computes kinematic twist-3, twist-4 and NLO alpha_s corrections to coherent DVCS on He-4 and extracts the first 3D quark-gluon tomography of the nucleus.

  4. Coherent deeply virtual Compton scattering on helium-4 beyond leading power

    hep-ph 2026-04 unverdicted novelty 5.0 of 10

    Higher-twist and NLO corrections to DVCS on He-4 enable the first 3D parton-level tomography of the helium-4 nucleus.

  5. Three-dimensional imaging of hadrons with hard exclusive reactions: advances in experiment, theory, phenomenology, and lattice QCD

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